How To Fix CNV799 - No or too many fields marked with Multicopy Position "First" in table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV - Conversion: Messages for Conversion Services (CNCC)

• Message number: 799

• Message text: No or too many fields marked with Multicopy Position "First" in table &1

What causes this issue?

If the "Multicopy" indicator is set, there must exist exactly one field
with Multicopy Position is set to 'F' (First in loop). "Multicopy"
indicator was set for table &V1& but there is either no field or more
than one field for which Multicopy Position set to "F".

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Either delete the "Multicopy" indicator for table &V1& or configure
exactly one field to be first in Multicopy Loop.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV799 - No or too many fields marked with Multicopy Position "First" in table &1 ?

  The SAP error message CNV799 indicates that there is an issue with the configuration of the multicopy position in a specific table during a data migration or conversion process. This error typically arises in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data transfer processes.
  Cause:
  The error message "No or too many fields marked with Multicopy Position 'First' in table &1" suggests that:
  
  No Fields Marked: There are no fields in the specified table (&1) that are marked as the "First" multicopy position. This is necessary for the system to know which field should be used as the primary reference when copying data.
  Too Many Fields Marked: Alternatively, if multiple fields are marked as the "First" multicopy position, the system cannot determine which one to use, leading to ambiguity.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Table Configuration:
  
  Go to the Data Dictionary (SE11) and check the structure of the table mentioned in the error message.
  Look for the fields that are marked with the multicopy position. You can do this by checking the field properties in the table definition.
  
  
  
  Adjust Multicopy Position:
  
  If no fields are marked, you need to select one field to be the "First" multicopy position. This is typically a key field or a field that uniquely identifies a record.
  If multiple fields are marked, you need to decide which one should be the "First" multicopy position and adjust the settings accordingly.
  
  
  
  Use Transaction Code:
  
  If you are using a specific transaction for data migration, ensure that the configuration settings for multicopy positions are correctly set up in the migration tool.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation or help resources related to the specific migration tool you are using. There may be guidelines on how to configure multicopy positions correctly.
  
  
  
  Testing:
  
  After making the necessary adjustments, test the data migration process again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  Multicopy Position: This is a concept used in data migration where certain fields are designated to be used as reference points for copying data. It is crucial for ensuring data integrity during the migration process.
  Data Migration Tools: Familiarize yourself with the specific SAP tools you are using for data migration, as they may have unique requirements or settings related to multicopy positions.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on configuring multicopy positions.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting with an SAP expert who can provide more tailored assistance based on your specific scenario.